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External carotid artery
The external carotid artery begins at the level of the upper border of thyroid cartilage, and, taking a slightly curved course, passes upward and forward, and then inclines backward to the space behind the neck of the mandible, where it divides into the superficial temporal and maxillary arteries after passing through the parotid gland.
It rapidly diminishes in size in its course up the neck, owing to the number and large size of the branches given off from it.
In the child, it is somewhat smaller than the internal carotid; but in the adult, the two vessels are of nearly equal size. At its origin, this artery is more superficial, and placed nearer the middle line than the internal carotid, and is contained within the carotid triangle.
The external carotid artery is covered by the skin, superficial fascia, Platysma, deep fascia, and anterior margin of the Sternocleidomastoideus; it is crossed by the hypoglossal nerve, by the lingual, ranine, common facial, and superior thyroid veins; and by the Digastricus and Stylohyoideus; higher up it passes deeply into the substance of the parotid gland, where it lies deep to the facial nerve and the junction of the temporal and internal maxillary veins.
Lateral to it, in the lower part of its course, is the internal carotid artery.
Posterior to it, near its origin, is the superior laryngeal nerve; and higher up, it is separated from the internal carotid by the Styloglossus and Stylopharyngeus, the glossopharyngeal nerve, the pharyngeal branch of the vagus, and part of the parotid gland.
Mnemonics are traditionally used to commit these branches to memory.
Mnemonics using modern terminology include "Some Anatomists Like Freaking Out Poor Medical Students", "Some Angry Lady Figured Out PMS", "Several Angry Ladies Fighting Over PMS", "Snoopy And Linus Fornicated On Papa’s Music Stand" and "Some Aggressive Lovers Find Odd Positions More Stimulating."
A memorable mnemonic appears in Samuel Shem’s classic novel The House of God (1978). Here Shem uses the older terms External maxillary artery for Facial artery and Internal maxillary artery for Maxillary artery. The Ascending pharyngeal and Superior thyroid appear in their correct sequence, while the names of the two terminal branches are reversed:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "External_carotid_artery". A list of authors is available in Wikipedia.|